Lightnews — Scholar-powered news

Jan Polcher

@polcher.bsky.social

60 followers 22 following 17 posts

Climate scientist and aviation fan ... Not afraid of contradictions !

Videos

Environmental science 62%

Geography 20%

Posts Media Videos Starter Packs

Jan Polcher @polcher.bsky.social · Jul 31

Bon appétit 😄

Reposted by Jan Polcher‬

GEWEX @gewex.bsky.social · Jun 13

The newest Crosscutting initiative within the GEWEX Hydroclimatology Panel is the River Experiment, or RivEx, led by a team determined to standardize the comparison of river models. Read up on RivEx in the latest issue of the GEWEX Quarterly, starting on page 5, at www.gewex.org/gewex-conten....

Reposted by Jan Polcher‬

Oliver Milman @olliemilman.bsky.social · Jun 11

Climate.gov was one of world's leading sources of information on climate change.

The Trump admin has now fired all of its staff and it will now likely shut down (or maybe turned into a Trump-friendly site pushing falsehoods about climate) www.theguardian.com/us-news/2025...

Climate.gov Home

Science & information for a climate-smart nation

Climate.gov

6 8

Reposted by Jan Polcher‬

The New York Times @nytimes.com · Jun 3

Thousands of scientists, academics, physicians and researchers have responded to President Trump’s executive order about “restoring a gold standard for science” saying it would destroy scientific independence.

The White House Gutted Science Funding. Now It Wants to ‘Correct’ Research.

Thousands of scientists, academics, physicians and researchers have responded to the administration’s executive order about “restoring a gold standard for science.”

trib.al

14 49 140

Reposted by Oliver L. Phillips, Kristie L. Ebi, Simon L. Lewis , and 6 more Oliver L. Phillips, Kristie L. Ebi, Simon L. Lewis, Peter A. Stott, Adam H. Sobel, Richard Betts, Benjamin I. Cook, Jan Polcher‬, Flavio Lehner

Gavin Schmidt @climateofgavin.bsky.social · May 31

Last day at the GISS building (Wed. May 28th). 🥲

Photo of the a large group of GISS employees/colleagues in front of Toms Restaurant with a prominent street sign saying "112th St" taken from the middle of Broadway. Credit: Tricia Baron.

50 150 730

Jan Polcher @polcher.bsky.social · Apr 9

A typical case of killing the messenger instead of fixing the problem. The international community will support GFDL as it is the leading institution on climate research.

Jan Polcher @polcher.bsky.social · Mar 21

I hope this report of UNESCO will lead to a better understanding by the society of the risk posed and trigger more research to better quantify the expected changes in water resources.

1 3

Jan Polcher @polcher.bsky.social · Mar 18

This will be an important conference!

Jan Polcher @polcher.bsky.social · Mar 1

Let the market punish those who are not exemplary Citizen 😄

Reposted by Jan Polcher‬, Rasmus K. Storm, Deborah M. Kolb

Liz Cheney @lizcheney.bsky.social · Feb 28

History will remember this day— when an American President and Vice President abandoned all we stand for.

720 5.1K 23K

Jan Polcher @polcher.bsky.social · Feb 28

How are you going to fly your bird without NOAA providing the observations and forecasts ? These people in charge have no idea what it takes to keep aviation (among other things !) functioning.

1 2

Jan Polcher @polcher.bsky.social · Feb 27

Thanks for the clarification

Jan Polcher @polcher.bsky.social · Feb 15

I think I saw your little bird when I landed in SYD yesterday 😀

1 1

Jan Polcher @polcher.bsky.social · Feb 15

If we don't stand up for science then truth has no meaning anymore !

1 6 40

Jan Polcher @polcher.bsky.social · Feb 14

That was a productive meeting!

Jan Polcher @polcher.bsky.social · Feb 5

An important seminar for the Land surface modelling community!

Reposted by Jan Polcher‬

GEWEX @gewex.bsky.social · Jan 16

The latest GEWEX E-News is now available at gewexorg.optin.com/newsletter/a...

This edition includes the latest calls for papers, position announcements, meeting details and other news of interest.

1 1

Jan Polcher @polcher.bsky.social · Nov 22

Welcome to BlueSky! GEWEX will hopefully also help society adapt to the water resources of a warmer climate by coordinating the scientific community.

Jan Polcher @polcher.bsky.social · Nov 16

Made me think why not develop some type of "Turing tests" for geophysical models (AI, parsimoneous or physical based)? There are a number of perturbations (like 2xCO2) where we know what the characteristics of the response should be on physical arguments.

Jan Polcher @polcher.bsky.social · Nov 13

Yes produce more high quality knowledge which will not be contradicted by facts down the road 😄

Jan Polcher @polcher.bsky.social · Nov 13

Should climate science not take pride in having provided society with very similar results for the last 30 years ? So it might be good enough to propose projections every 10 years, when our understanding has indeed progressed. Earth observation needs to be intensified to inform society and science.

Jan Polcher @polcher.bsky.social · Nov 12

It is going to be an issue that we cannot have the same numbers for the global water cycle : total precipitation, water discharge from the continents, total water mass, ... Our observing system is not to the level needed for these variables which are so critical for managing our resources!

Jan Polcher @polcher.bsky.social · Oct 13

Thanks for posting also on Blusky ...so I can finally ditch the network of that mad man !